Dictating machine



Nov. 287 1939. D. NORTON 2.181,437

DICTATING MACHINE Original Filed Oct. 5, 1936 I REPRoDucE INVENTOR Leland Nron ATTORNE extending across the outer end of slot l5 and in position to be engaged by a terminal hook 51 on a link 58 pivoted at 59 to move with lever 21.

It will be noted that the stylus arm 23 is pivoted at 60 to a bracket carried on the underside of conduit 53 and that the recording stylus 6l and the reproducing stylus 52 are mounted in conventional relation on stylus arml 23.

In apparatus according to my inventlon, I employ along with the above described conventional or known devices or equivalent operative struc-A crystal plates 63 and suitable electrodes including a plate 64 of metal foil, for example, connected to a conductor wire 66 and interposed between said crystal plates. An outer metal plate 65 connected to conductor wires 61 is mounted against the outer surface of each of said crystal plates 63. A terminal plate 68 is conveniently located at the inner end of sleeve and provided with binding posts 69.

As shown in Figs. 2 and 3, the crystal plates 3'0 63 are retained between the opposed walls of the casing 22 by resilient supports, as rubber spacers 1G engaging said plates at three corners. A pin 1l is secured to the free corner of the crystal plates and to an intermediate portion of the '-3-5 stylus arm 23 after passing through an opening 12 in the casing 22, said opening being sealed against passage of moisture by a membrane 13 extending across and covering said opening and closely embracing the shank of pin 1 I being preferably adhesively secured thereto. The opening in the opposite wall of casing 22 and through which the conductor wires are led to the interior thereof, may be substantially sealed to exclude moisture by a thin sheet 14 of suitable moisture resistant material lying against the inner face of said wall and with its edges held down under the annular gasket 15 of rubber or other suitable resilient material. A passage for the conductors 66 and 61 to the interior of the casing may be .provided in any suitable way, here shown as o through the sealingsheet 14, care being taken to minimize leakage of air into the casing.

As shown in Fig. 2, the casing 22 is in effect a shell made up of cooperating shallow cupshaped members one of which is secured to the outer end of hollow conduit 53. 'Ihe other or outer cup-shaped member serves as a cover and when held in position, as by bolts 1B, Fig. 3, retains the gasket 15 and the crystal plate assembly in operative position inside the casing 22.

As many embodiments might be made of the above invention, and as many changes might be made in the embodiment above described, it is to be understood that all structure hereinbefore described or shown in the accompanying drawing is to be considered as illustrative only and not in a limiting sense.

I claim:

1. For use in a commercial phonograph, an

Y electro-mechanical translating device adapted to other angle of said crystal, a recording stylus mounted on said lever at a point more remote from the point at which said lever is attached to said support than the point on said lever which is connected to said crystal, and a reproducing stylus mounted on said lever at a point more remote from the point at which said lever is attached to said support than said recording stylus, whereby the load arm of said lever when conditioned for recording is greater than the load arm of said lever when conditioned for reproducing.

2. For use in a commercial phonograph, an electro-mechanical translating device adapted to operate alternatively as a recorder and reproducer element, comprising, in combination, a support including a casing, at least one piezo-electric crystal disposed in said casing, said crystal having the form of a polygonal plate supported at certain of its angles within the walls of said casing, resilientmeans interposed between said angles and the casing, a lever mounted on said support for oscillation relative thereto, a recording stylus mounted on said lever, a reproducing stylus mounted on said lever,v and a substantially rigid connection between another angle of said crystal and said lever at a point nearer to said support i.

than said styli, the lever arm of said recording stylus being shorter than the lever arm of said reproducing stylus.

3. A combination recorder and reproducer element adapted for alternative use in a commercial phonograph, comprising, in combination, a flexing piezo-electric crystal, a support for said crystal, a lever flexibly mounted at one end on said support, a reproducing stylus mounted at the other end of said lever, a recording stylus mounted on said lever intermediate said support and said reproducing stylus, and a driving member operatively connecting said crystal to said leverat a point intermediate said support and said recording stylus.

LELAND D. NORTON. 

